There is a description of the Free Comic Book Day New 52 book in this article. According to the description it will focus on Pandora (Purple Lady). It will focus on her motivations and what characters she has been watching (we probably got clues about this latter during all the issue ones she was in). Also Darkseid is confirmed as the cosmic big bad (pretty obvious if one has been reading Justice League) with whatever the New 52 is leading up to. Also we might be in for the return of some fan favourite characters.

Knowing how Hal has been written lately that would match his personality. I liked the cover for Justice League #6 better with them all kneeling before Darkseid, except for Batman who looks like he's planning a counter attack. Sigh. It is sad how much disinterest I have for Justice League right now. LOL